CI step printing dependency diff

[magik6k]

In dependency-updating PRs it would be really convenient to have a CI step which would print diffs of code in dependencies - so it's easy to see changes in deps.

This can be done with something like:

git clone -b [base branch] https://github.com/filecoin-project/lotus a
git clone -b [target branch] https://github.com/filecoin-project/lotus b
cd a
make buildall
go mod vendor
cd ../b
make buildall
go mod vendor
cd ..

diff -r --color a/vendor b/vendor

Just need to make this into a CircleCI step.

Example output comparing current master with deps/update-libp2p: https://gist.github.com/magik6k/c4013988d8230aadc1de1d9d4a9809b5

[AleemRehman]

@magik6k / @jennijuju can have a look at this?

[jennijuju]

@magik6k / @jennijuju can have a look at this?

Hi! Do you mean you wanna work on this one?

[witnsby]

Hello @jennijuju, can I be assigned to it?